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VOLUME 68 (1998) | ISSUE 6 | PAGE 442
Theory of sonoluminescence in single bubbles: flexoelectric energy contribution
We introduce an equation of motion for a cavitating gas bubble immersed in a liquid which includes a flexoelectric energy term. This energy is deduced from the electric field produced by the bubble wall acceleration (pressure gradient) in the fluid (flexoelectric effect). We show that, in sonoluminescence conditions, this electric field reaches values of typical electric breakdown in water. Our theoretical results is consistent with duration of light emission, bubble minimum radius and released energy as measured in sonoluminescence experiments in water.